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Electronics => Beginners => Topic started by: mrpsychotic on December 02, 2010, 06:37:45 am

Title: Cheapest DIP glue logic
Post by: mrpsychotic on December 02, 2010, 06:37:45 am
I am looking to by some glue logic chips to prototype in so they must be in dip packages. I also want them to be cmos chips and not ttl. I am looking for which family of logic is the cheapest and for a good place to by them on the cheap. I don't care about the specs that much in terms of speed by I would hope for 5V and the ability to supply 15mA or more. The reason I am asking instead of finding the answers for myself is that I have already tried looking but there seem to be so many families that are very similar and I cant come to a conclusion. Ii was hoping that somebody who had some experience working with them would have some insight into me question.
Title: Re: Cheapest DIP glue logic
Post by: EEwannabe on December 02, 2010, 07:36:55 am
Are you looking for the 4000 series?
http://en.wikipedia.org/wiki/4000_series (http://en.wikipedia.org/wiki/4000_series)

- Patrick
Title: Re: Cheapest DIP glue logic
Post by: CryptLordGR on December 02, 2010, 09:27:45 am
As you want also to drive 5 V you could use the 74HCTxxx which are CMOS based and can work also with the power levels of the ttl
Title: Re: Cheapest DIP glue logic
Post by: mikeselectricstuff on December 02, 2010, 10:33:49 am
74HC and 4000 series are the most commonl and cheapest. 74HC is faster, 4000 has wider supply voltage range of 3-15V
Title: Re: Cheapest DIP glue logic
Post by: Zero999 on December 02, 2010, 06:28:37 pm
The 4000 series doesn't  meet that specification because the output current is too low.

74HC is good because it has a supply voltage range of 2V to 6V. HCT is the same but TTL compatible so only rated for 4.5V to 5,5V. I prefer 74HC because I don't have any TTL gates.